Sunny Health & Fitness Air Bike Fan Exercise Bike with Digital Monitor, Full Motion Arm Exercisers, and Adjustable Seat Featured! $169.98 Make sure this fits by entering your model number. BELT & CHAIN DRIVE: The fan wheel creates resistance using the belt-drive, which keeps the bike quiet/low maintenance. Pedals are connected to the chain drive system giving you the feeling of an outdoor bike. SOLID CONSTRUCTION: The Zephyr Air Bike’s steel cage protects and keeps the resistance wheel intact while the heavy duty frame construction keeps the bike durable during those vigorous workout sessions.